Hesse–BiberS., & JohnsonR. B. (Eds.). (2015). The Oxford handbook of multimethod and mixed methods research inquiry. New York, NY: Oxford University Press.
4.
Plano ClarkV. L., & IvankovaN. V. (2016). Mixed methods research: A guide to the field. Thousand Oaks, CA: Sage Publications, Inc.
5.
TashakkoriA., & TeddlieC. (Eds.). (2010). SAGE Handbook of Mixed Methods in Social and Behavioral Research. Thousand Oaks, CA: Sage Publications, Inc.